A to reduce the workload hope it helps ☺
Preserving a historic structure makes sound environmental conservation policy and practice. Maintaining the use of a building is the ultimate in recycling since no demolition waste is generated, no processing of materials is required, and no energy consumed.
Answer:
Vaccines
Explanation:
It is not known if it was a Chinese or Indian discovery but it was not popularized before the use in 1796. In 1796 Edward Jenner inoculated a boy in England and that prevented him from getting smallpox. This was later used as the groundwork for developing vaccines and today's vaccine culture and mass immunization would not be possible without Jenner and his experiments.
The a answer is C. Philadelphia
The answer is b because it basically explains it oby
